The team became stuck in a Tham Luang Nang Non cave on June 23, but the location wasn't discovered until July 2. On Thursday, a former Thai Navy SEAL fell unconscious while swimming through the cave and could not be revived.
The development came as leaders of the rescue effort in Chiang Rai edged closer to a decision on whether it would be practical to bring the boys out over the next few days. He's promising that the sub would be "extremely robust" - small enough to get through the tight cave network, and light enough to be carried by two divers. By the time he posted the test drive videos, four boys had already been rescued and the operation was suspended for the night.
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Notorious gangster flees French jail by helicopter
He took families, couples and once a police officer hostage during the years-long spree, according to the Telegraph . The helicopter was found abandoned and torched in Garges-les-Gonesse, a town in the suburbs north of Paris .
The tubes and pods are being built in the U.S., a spokesman said.
One of the main working theories of how to retrieve the boys is to train them to dive out of the cave.
He also said that when teams had stopped pumping water for 12 minutes during the day on Friday, the water level in the cave rose by 10cm (4in).
Former Thai Navy SEAL Samarn Kunan died trying to get oxygen to the group, which just how unsafe getting them out would be. At times, the boys had to be hooked up with full-face oxygen masks as they swam through water filling the narrow, pitch-black cave channels.
More than 100 chimneys are being drilled into the mountainside in a frantic bid to reach a Thai youth football team trapped in a cave complex below, the head of the rescue mission said today.